The first one not actually 100 percent tried but if the monster can do it why not players.
1. If you fight two identical mobs, like the monsters in the dark elf village swamp and one bleeds you, and the other bleeds you, you will see two bleed de-buffs on your bar and you loose hp at faster rate. So in theory and I haven't check it yet, you could get de buffed twice by the same class, my guess is it's working. Either way its annoying...
2. Not sure how long this possible exploit has been in the game but just found it out since my Doom cryer can spam certain skills over and over, and if someone hits you while this is taking place you will take their target and flag... So you could be a mage using one skill over and over and someone will flag you and you now flag them... This one is 100 percent tested...